This is a true story, some of the events are marginally different. But only from my bad memory!
I am a slim white male, early twenties, 5'11" with an 8" cock. I've always had a very high sex drive; this has led to me having lots of fantasies over the years. Initially I would just fantasise about girls I knew, but as I watched more porn and read more erotica I began to broaden my horizons. I started watching a lot of MILF porn and this led, inevitably, to thoughts about my own mother. She is 5 foot, slim, good looking, with larger than average breasts. She often wears tops that give me a view of her cleavage and every now and again when she would lean forward or bend over I could see her nipples. Any resistance to arousal would disappear at these moments and I began to seriously imagine what fucking my Mum would be like. I began to read more and more incest erotica, and I would cum heavily when thinking about her. I had no idea that it would turn out the way it did though.....
I was home alone on a Saturday afternoon, which as it didn't happen very often, meant I was sitting at my computer naked reading mum and son porn online. One of my favourites at the time involved a guy who also had a fantasy about his mother, and he would jack off with his mum's panties around his cock. The thought of jacking off with something that had been on my mum's pussy was too much for me so I went to the laundry basket.
After a quick look I managed to find a white lace pair, I quickly brought them back to my room. I brought them up to my face and took a long sniff of my mother's pussy, then unable to help myself I started licking them. I had become absolutely rock hard, I couldn't believe how turned on I had become by my mum's panties. Instead of rubbing them on my cock I had an urge to try them on. As I pulled them up I couldn't believe how turned on I was getting, I had to adjust to fit my 8" cock in them, and pulled up the back so it slipped between my cheeks.
I went over to my full length mirror and was amazed at how hot I looked with my cock straining against the lace panties. I stroked it through the panties and almost exploded, quickly realising this might be a bad idea in my mum's panties! I turned around to see my ass, and it looked so appealing. My cute tight ass in a pair of panties is a sight I will never forget, I have never been so turned on by someone's ass.
I sat back down in the panties and pulled my cock out and started stroking it. Knowing that my usual incest porn wasn't going to be enough for me, I wondered what I needed. I went back to the category screen and the transsexual section jumped out at me. It's not something I'd ever considered before but after seeing my cock in a pair of panties I had to have a go. I searched for something still involving incest and I was not disappointed.